Sizing approach of high torque density motors for aircraft application

The paper deals with PM-brushless radial flux machines with high torque density suitable for aircraft application where a high specific torque in a reduced range of operating speeds is needed. In particular, the goal is to obtain some useful relations among geometric, electrical, magnetic and thermal variables, to define an analytical expression of the torque density as a function of both the maximum thermal and magnetic stresses allowed by the active materials.